How can I change a 80mph speedometer from a 79 Ford Ranchero to a 120 mph?

Asked by Mar 20, 2017 at 11:21 AM about the 1979 Ford Ranchero

Question type: Car Customization

I tried replacing the speedometer with one from a 76 Ranchero, but it didn't work.  I need to know the transmission speedometer drive gear ratio for a 3 speed automatic.

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http://forum.grantorinosport.org/info-72-79-gauge-clusters-and- wiring_topic2933.html

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